This boolean data property identifies components that play primary or central roles within a causal relationship according to theoretical emphasis or empirical significance. When set to true, it indicates that this entity represents a major causal driver or critical outcome that is theoretically privileged or empirically dominant in the relationship. This property helps distinguish between core mechanisms and peripheral factors in complex sociological processes, enabling researchers to identify which elements deserve primary analytical attention. It supports hierarchical understanding of causal relationships by marking theoretically essential components that should receive priority in research design, policy interventions, or educational presentations of sociological knowledge.